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O2O江湖:2015大洗牌 2016 BAT等巨头将“肉搏” - 资讯 - 清泛网 - 专注C/C++及内核技术
...，而轻易获得融资的泡沫时代已经过去，资本寒潮正开始筛选冲刷掉那些缺乏创新又不能满足用户需求的到家O2O企业。
但O2O领域中，到家业务的战争其实才刚刚开始，甚至可以说到家业务真正的战争还没有开始。
阿里此前不...
MongoDB副本集详解 优于以往的主从模式 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...，但是默认情况下不能避免人为的失误。
比如没有指定筛选条件删除了全部的数据。副本节点会应用这个命令，删除所有副本节点的数据。
在这个场景下，可以使用延迟节点，它会延迟应用复制。
如果主节点发生了人为的失...
Android 4.3 Bluetooth Low Energy unstable
... advertising
Better not use android.bluetooth.BluetoothAdapter#startLeScan(UUID[] serviceUuids, LeScanCallback callback) with the parameter to filter for certain service UUIDs because this is broken completely in Samsung Galaxy S3 with Android 4.3 and doesn't work for 128bit UUIDs in general.
Gatt a...
Return rows in random order [duplicate]
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For MySQL use ORDER BY uuid(). (...for those arriving on this page via a generic search, like me!)
– Stan James
Jan 7 '12 at 4:15
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Get the Last Inserted Id Using Laravel Eloquent
... autoincrement, this will always return 0. In my case the id was a string (UUID) and for this to work I had to add public $incrementing = false; in my model.
– Luís Cruz
Apr 20 '15 at 17:18
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NodeJS: Saving a base64-encoded image to disk
...ase64 file, it return filename save it in DB.
import fs from 'fs';
const uuid = require('uuid/v1');
/*Download the base64 image in the server and returns the filename and path of image.*/
function saveImage(baseImage) {
/*path of the folder where your project is saved. (In my case i got it fr...
How do I import a specific version of a package using go get?
...n. Follow these steps:
go mod init .
go mod edit -require github.com/wilk/uuid@0.0.1`
go get -v -t ./...
go build
go install
Here's more info on that topic - https://github.com/golang/go/wiki/Modules
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ActiveRecord OR query
...ys as arguments, the following code works in Rails 4:
query = Order.where(uuid: uuids, id: ids)
Order.where(query.where_values.map(&:to_sql).join(" OR "))
#=> Order Load (0.7ms) SELECT "orders".* FROM "o
Difference between __str__ and __repr__?
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This is true because for obj = uuid.uuid1(), obj.__str__() is "2d7fc7f0-7706-11e9-94ae-0242ac110002" and obj.__repr__() is "UUID('2d7fc7f0-7706-11e9-94ae-0242ac110002')". Developers need (value + origin) whereas customers need a value and they don't care h...
Create a unique number with javascript time
...presentation, not sure though, but i can see the problem, if you call your uuid generator often enough, only last 3 chars are changing so the chances are high that you will get into a collision. You get much better odds if you just stick to new Date.getTime() calls. But hey if it worked for your pur...